Make remote CoreAnimation GPU-switching aware

Make remote CoreAnimation GPU-switching aware

Send the CGL renderer ID for the context being used by the
CAOpenGLLayer.

Tested with WebGL apps, gfxCardStatus switching.

BUG=312462
Committed: https://crrev.com/0707401c21b531d870f924c715949a2aca53394f
Cr-Commit-Position: refs/heads/master@{#299204}

[ccameron, 2014-10-10 18:26:01]

ccameron@chromium.org changed reviewers:
+ kbr@chromium.org

[ccameron, 2014-10-10 18:34:00]

(okay, this is the right codereview ...)

When using IOSurfaces, I found that I needed to create a new context after every
GPU switch. Based on my testing, that isn't necessary (this may be because we're
not using IOSurface or it may be because we're all in the same process).

[jbauman, 2014-10-10 21:24:46]

jbauman@chromium.org changed reviewers:
+ jbauman@chromium.org

[jbauman, 2014-10-10 21:24:47]

lgtm

[ccameron, 2014-10-10 21:25:14]

thanks!

[ccameron, 2014-10-10 21:25:20]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-10-10 21:25:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/647053002/1

[commit-bot: I haz the power, 2014-10-10 21:41:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-10 21:41:36]

Try jobs failed on following builders:
  linux_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_trigger...)
  mac_gpu_retina_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_retina_tr...)
  mac_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/mac_gpu_triggered...)
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[ccameron, 2014-10-10 21:48:01]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-10-10 21:48:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/647053002/1

[commit-bot: I haz the power, 2014-10-10 22:34:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-10 22:35:08]

Patchset 1 (id:??) landed as
https://crrev.com/0707401c21b531d870f924c715949a2aca53394f
Cr-Commit-Position: refs/heads/master@{#299204}

[Ken Russell (switch to Gerrit), 2014-10-10 23:09:38]

LGTM if this has been tested. I recall there were rendering issues on some
dual-GPU machines the first time we attempted to forcibly set the CGL renderer
ID.